// 设置常见屏幕尺寸
html{
    font-size: 50px;
}
a{
    text-decoration: none;
}

@num:15;
@media screen and (min-width:320px){
html{
    font-size: 320px / @num;
}
}
@media screen and (min-width:360px){
    html{
        font-size: 360px / @num;
    }
    }
 @media screen and (min-width:375px){
        html{
            font-size: 375px / @num;
        }
        }
        @media screen and (min-width:384px){
            html{
                font-size: 384px / @num;
            }
            }
            @media screen and (min-width:400px){
                html{
                    font-size: 400px / @num;
                }
                }
                @media screen and (min-width:414px){
                    html{
                        font-size: 414px / @num;
                    }
                    }
                    @media screen and (min-width:424px){
                        html{
                            font-size: 424px / @num;
                        }
                        }
                        @media screen and (min-width:480px){
                            html{
                                font-size: 480px / @num;
                            }
                            }
                            @media screen and (min-width:540px){
                                html{
                                            font-size: 540px / @num;
                                        }
                                        }
                                        @media screen and (min-width:720px){
                                            html{
                                                font-size: 720px / @num;
                                            }
                                            }
                                            @media screen and (min-width:750px){
                                                html{
                                                    font-size: 750px / @num;
                                                }
                                                }
